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perhaps towing a heavy load will cause them to bend and thus hinder towing?
Nah. Turbo fins work fine for towing. We have towed an Outfitter with 2 kids many miles and all day behind our Oasis with seemingly little more effort than if we did not have them in tow. We have also done a turbo fin to non-turbo fin tug race between two Outfitters tied stern-to-stern and again the turbo fins shined, even with the stronger pair on the non-turbo fins. Now, we do keep our turbo fins adjusted for minimal flex.
Peter